176 PROCEEDINGS OF THE ACADEMY OF [1885. 



instead of black only as in its analogue. In the much greater 

 length of secondaries, and in their rounded outer margin, which 

 in Pausanias is in a straight line from anal angle to apex. In 

 the secondaries being, except along the costa, entirely blue, 

 whilst in the other species that color is confined to the basal half 

 of wing only. 



On the underside in all wings being uniform dark brown, the 

 primaries being devoid of the paler color of outer margin and 

 apical part, as well as of the two or three small yellowish sub- 

 marginal spots near the inner angle, and in the secondaries being 

 without the alternating pale brown rays which emanate from the 

 submarginal crimson lunules in Pausanias, as well as in the 

 absence of the crimson line which in the latter continues from 

 the anal lunule along the median nervure to base. 



Both these species imitate in a remarkable manner Heliconius 

 Clytia, but the mimicry is more complete in Pausanias, owing to 

 its greater length of fore-wing and narrowness of hind-wing. 



Of the last-named species I have seen many examples, of the 

 present described only the single type now before me. 



Theorema Titania. 



Expands 2 inches ; form of T. Eumenia. 



Upper surface. Primaries black, disc and base covered with 

 dark shining greenish scales ; apex tipped with a paler silvery 

 green, which is cut with white hy the veins at and near their 

 termination ; a black marginal line succeeded by pure white 

 fringe. 



Secondaries black with a slight powdering of shining green 

 atoms ; a fairly broad glittering green marginal band extending 

 from apex where it is narrowest to beyond the last median 

 nervulc where it attains its greatest width, this band is cut by 

 the veins, which are black, and is separated from the white fringe 

 by a black line ; on the inner margin above anal angle is a small 

 white spot. Tail black, fringed with white. 



Under surface. All wings black. Primaries narrowly mar- 

 gined with greenish silver, broadest at apex ; fringe white. 

 Secondaries with three parallel rows of bluish white or silvery 

 spots; those nearest the margin are crescent-shape, connected 

 with a marginal line of same color; in the next row they are 

 small, and with the exception of one, which is lunate, are round 



